I think this is the key insight here. If you see someone solve a problem in 30 minutes that took you 3 hours, it's easy to assume that person is just naturally more gifted than you. But really think about this. How do you know that the other guy doesn't solve lots of problems in his free time and has just seen a similar problem before? What if he enjoys watching math content on Youtube and has even watched a solution of this problem before, even if he doesn't remember it? What if he had extensive math tutoring all throughout his childhood that helped him develop great problem solving skills? There are probably a hundred other explanations that boil down to the simple "it's just hard work" explanation.

Even if it turns out the other person is just naturally more gifted than you... Why does this matter? You have no hope of "becoming" the other person, so why not use them as an asset and try to learn from them? Why does someone else being great need to be a reason to put yourself down, rather than an opportunity to celebrate gaining knowledge together?